Question about 1987 Ford F 150

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1987 Ford F150 makes a hissing sound when applying the brakes. The braking seems to work. Someone said it means master cylinder is going out.

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Hello kenadams621,


Probably not the macter cylinder more likely the brake booster has a vacuum leak.

Regards,
netvan

Posted on Mar 20, 2011

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  • Master
  • 1,102 Answers

Hissing is more associated with a failing brake booster. Since it uses manifold vacum developed by the running engine, you will hear a hiss as the engine tries to restore the lost vacum.

Posted on Mar 20, 2011

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